True. It really depends on what it is made of and how it's stored. Grape wine made from wine grapes will last just as long as commercial wine as long as you use sulfite etc. and decent corks or other closures.

Unless you have a great grape then longer potentially. A great tannic red wine which is pretty acidic and aged well in a good bottle in decent storage conditions, maybe 15 20 years or so. Same as commercial wines. It would have to be just right and just like commercial stuff you would be drinking it over time and you would know if it peaked and the quality was dropping off.

I have to answer this... I just opened a bottle of Blackberry wine my Grandfather made and bottled 11/1999. This is over ten years old and it is unbelievable! I found a case I had forgot about in my fathers garage. I had received several cases after my Grandfather went to heaven because I appreciate the wine the most. Wow, I am amazed as I expected to be opening a bottle of vinegar! It is actually better now than it was in 1999. I have 11 more bottles to try, from strawberry, crab apple and grapes. I hope that they are all this good! This has been stored in a box, in a non insulated garage in Oregon. The bottles got to below freezing every year

A friend just brought around a bottle of 1984 elberberry wine, we drank it on New year's Day 2010. It was superb - it had matured into something like a dark, dry sherry.

For the record, in 1961 a bottle of steinwein made in 1540 (yes - 1540!) was opened and drunk with pleasure in London when it was 421 years old; the production methods in 1540 would not have been more sophisticated than most home wine making (although on a bigger scale)- os the answer can only be that it depends on the quality and sugar/alcohol content of the wine.

I made apple and raspberry wine in 2002.. moved three times since then.. for the first 6 yrs wine was stored on its side.. last four years have been sitting upright.. I was going to empty the bottles to clean them out for reuse.. very much to my surprise, the wine is still good- in fact quite good; aged and tastes alot like sherry.. it was very high content when bottled.. top quality supplies, good corks and shrink wrap toppers, so thats 10 yrs!